Please?
I wan t to do it wihtout a computer. When I pick a song and say"save as playlst" it goes into one, but then there is on ly one song in the playlist, it is not a playlist. How do i add more songs to a playlist?

You need to start one song in the "current" playlist, then swipe from left to the right to get back to the song list and hold on songs/albums and choose "add to current playlist" and once the current playlist is what you want then you go into the menu and "save playlist".

I think that is how I did it, long time since I used the feature now.

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The faster way is:
1) Go to your current "Now playing" list. Select "Remove all" under options. (ONLY REQUIRED IF YOU HAVE SOMETHING IN THE LIST)
2) Now add all the songs/album/artist you want to the reproduction list (add to the "Now playing" list, in other words)
3) Once you've done, go to "Now playing" and select "Save playlist". Give a name and it's done.

NOTE 1: If you add an artist, the songs get added in alphabetic order.
Instead if you open the artist and add the albums (even all together), OR open every single album and add all songs, the songs are added in "track number" order

NOTE 2: Also playlists can be added to the reproduction list. So if you want to merge 2 or more playlists, just replace the step 2 with "Add all playlists to the reproduction list".

NOTE 3: There's a bug when you add big playlists to the reproduction list: sometimes it could not add the last songs of the playlist.
To avoid this bug, open the playlist and add all the songs (even all together).